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What is the unit of length and weight in the second volume of mathematics in the third grade of primary school?
Common length units: meter (m), decimeter (dm), centimeter (cm) (km, km, mm, mm).

Common weight units: gram (g), kilogram (kg) and ton (t)

The third grade begins to learn the area. Commonly used area units are: square meter m? , square decimeter dm? , square centimeter cm? . (Less commonly used in the three levels are: square kilometers, hectares and square millimeters)